Nicotine gum is used to help a smoker
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请选择（13）处的最佳答案．
A. a more
B. more
C. most
D. the most
Among other things,the story shows that
根据下列材料请回答 31～35 题:
第 31 题 According to the passage，which of the following has changed the most in the last 500 years？
With the development of society, people, especially the young people,____________
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